Ways to climb 12 stairs (1 or 2 steps).
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using System;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main()
{
int n = 12;
int a = 1, b = 1;
for (int k = 2; k <= n; k++) { int t = a + b; a = b; b = t; }
Console.WriteLine(b);
}
}Prefer Coach (Nudge → Guide → Approach) before revealing. No forced signup.
Same as Fibonacci — classic DP intro.
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